On the authzperf branch: Expose the stringbufs from the config parser to
the config constructor callbacks.

* BRANCH-README: Update TODO and DONE lists.

* subversion/include/private/svn_config_private.h: Include svn_string.h.
  (svn_config__open_section_fn,
   svn_config__close_section_fn,
   svn_config__add_value_fn): Change all the const char* parameters to
    svn_stringbuf_t*.
* subversion/libsvn_subr/config_impl.h, subversion/libsvn_subr/config.c
  (svn_config__default_add_value_fn): Update to match API change.
* subversion/libsvn_subr/config_file.c
  (open_section, close_section, add_value): Update callback invocations.

* subversion/libsvn_repos/authz_parse.c
  (check_open_section, groups_open_section, groups_add_value,
   rules_open_section, add_alias_definition, add_access_entry,
   rules_add_value, close_section): Update prototypes to match the API change
    and use the known string length whenever that's possible.


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/authzperf@1616996 13f79535-47bb-0310-9956-ffa450edef68